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Difficulty:
25%
(medium)
Question Stats:
81% (01:38) correct
19%
(01:35)
wrong
based on 32
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History
Date
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Not Attempted Yet
There are 1,200 golf balls in a golf ball dispensing machine. The probability that the ball has a red stripe is 1/9th the probability that the golf ball has no stripe. How many of the golf balls in the dispensing machine have a red stripe?
(A) 108
(B) 120
(C) 150
(D) 251
(E) 320
(A) 108
(B) 120
(C) 150
(D) 251
(E) 320
Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Data Sufficiency (DS) Forum
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08 Dec 2015, 09:55
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An extra proviso is needed for this question. I have added it in green.
One approach is to TEST the answer choices.
The probability that the ball has a red stripe is 1/9th the probability that the ball has no stripe.
This tells us that the number of striped balls is 1/9 the number of balls with no stripe.
Or we can say that the number of balls with no stripe is 9 TIMES the number of striped balls.
Now let's test the answer choices.
A) 108
If there are 108 striped balls, then the number of balls with no stripe = 1200 - 108 = 1092
1092 is NOT equal to 9 TIMES 108
Eliminate A
B) 120
If there are 120 striped balls, then the number of balls with no stripe = 1200 - 120= 1080
1080 IS equal to 9 TIMES 120
Perfect!
The correct answer is B
Cheers,
Brent
Quote:
One approach is to TEST the answer choices.
The probability that the ball has a red stripe is 1/9th the probability that the ball has no stripe.
This tells us that the number of striped balls is 1/9 the number of balls with no stripe.
Or we can say that the number of balls with no stripe is 9 TIMES the number of striped balls.
Now let's test the answer choices.
A) 108
If there are 108 striped balls, then the number of balls with no stripe = 1200 - 108 = 1092
1092 is NOT equal to 9 TIMES 108
Eliminate A
B) 120
If there are 120 striped balls, then the number of balls with no stripe = 1200 - 120= 1080
1080 IS equal to 9 TIMES 120
Perfect!
The correct answer is B
Cheers,
Brent
Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Data Sufficiency (DS) Forum
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
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